I'm building such a moving-film-slot-type panoramic camera out of a 35mm camera. I figure I can then print the negatives with my 4x5 enlarger. I was going to have the camera rotate with the aperture at the center of the rotation. It seemed the obvious way to do the calculations, but looking at currently existing cameras, it doesn't look like they do. It kind of looks like the cirkut cameras, both the aperture and the film plane trace out circles. In my design, the aperture would be stationary and the film would move around it.

Also, what is a good lens focal length for this type of camera? I only have a 50mm lens for this camera. I think the vertical angle-of-view should be pretty good actually. Are lenses for these cameras of the "long", "normal", or "wide" family?